[time-nuts] HP 105B Modification

[Bruce Griffiths]

Corby Dawson wrote:
> Ed,
>
> The easiest way is to couple out the 10Mhz from the two pins on the
> connector holding the 10811 into a Fet input buffer amplifier that can
> drive 50 ohms.
>
> There are lots of FET buffer schematics floating around.
>
> Try the radio amateurs handbook or google it.
>
> Good Luck!
>
> Corby Dawson
A better way (if mechanically feasible) is to build a small 2 output 
distribution amplifier.
Drive the distribution amplifier directly from the 10811A.
Use one output to drive the divider and the other for the desired 10MHz 
output.
The 10811A output can easily drive a couple of transformer feedback CE 
amplifiers connected in parallel.

Most of the buffer amplifiers in the ARRL handbook have relatively high 
phase noise floors.
FET buffers tend to be relatively noisy when the noise of the gate 
suppressor resistor is taken into account.


Bruce